If `n_(1), n_(2 ) "and" n_(3)` are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by
A. `n = n_(1)+n_(2)+n_(3)+.....`
B. `n = sqrt(n_(1) xx n_(2) xx n_(3) xx........)`
C. `(1)/(n) = (1)/(n_(1)) + (1)/(n_(2)) + (1)/(n_(3))+....`
D. None of these
